Vibration control unit and vibration control support device

Abstract

To provide a vibration control unit which has high vibration absorbing qualities and vibration damping performance, is small, lightweight, and inexpensive, and is preferable for supporting a vibration controlled body such as a precision machine, and to provide a vibration control support device.SOLUTION: A vibration control unit (10) includes: a plate spring member (11) integrally having a first spring part (12), a first connection part (15) connected to a base, a first extension part (17) located between the first spring part and the first connection part, a second spring part (13) which is open in a direction opposite to an opening direction of the first spring part, a second extension part (18) located between the second spring part and the second spring part, a third spring part (14) which is open in a direction opposite to an opening direction of the second spring part, a third extension part (19) located between the third spring part and the second spring part, a second connection part (16) connected to a vibration controlled body, and a fourth extension part (20) located between the third spring part and the second connection part; a vibration control member (22) which absorbs vibration applied to the plate spring member through the base or the vibration controlled body. The vibration control member has vibration damping parts (22a, 22b, 22c) fastened to at least inner surfaces of the first spring part and the third spring part of the plate spring member.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a vibration isolation unit that supports an object to be vibration-isolated and absorbs vibration, and a vibration isolation support device including the vibration isolation unit.

Background Art

[0002] Vibration isolation support devices are used for various precision machines such as various sensors, control units, and actuator units that operate precisely, which are mounted on vehicles such as automobiles and railways, aircraft including rockets, and various working devices such as hydraulic shovels. These precision machines are supported by a base on which they are mounted, and to prevent the precision machines from being damaged by vibrations applied to the base by the precision machines. Most vibration isolation support devices are interposed between a precision machine and a base that supports the precision machine. In addition, vibration isolation support devices that suppress the transmission of vibrations to the base are widely used between machines that generate vibrations, such as engines and motors, and the base.

[0003] For example, Patent Document 1 discloses a vibration isolation device (vibration isolation unit) provided between a marine engine and a base. The vibration isolation device of Patent Document 1 uses a leaf spring formed in a U shape, is provided between a base and a supported body such as an engine, and supports the supported body so as to float upward from the base by the vibration isolation device. Further, in order to reduce the impact when the base and the supported body approach and collide due to strong vibrations, a rod body protruding downward from the supported body is provided, and an elastic member serving as a bump cushion is disposed so as to face the head of the rod body.

[0004] In addition, Patent Document 2 discloses a vibration isolation device (vibration isolation unit) for mounting a precision machine such as a compact disc player on a vehicle. The vibration isolation device of Patent Document 2 includes a spring member formed in an Ω shape between a supported body such as a compact disc player and a base, and supports the supported body by a plurality of vibration isolation devices.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Laid-Open No. 5-8793 [Patent Document 2] Japanese Utility Model Laid-Open No. 61-34696 [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] In recent years, a large number of precision machines such as sensors, control units, and actuator units have been mounted on vehicles, aircraft, work machines, etc. For the support parts of these precision machines, an anti-vibration support device having high vibration absorption and vibration damping properties, and being small, lightweight, and inexpensive is required.

[0007] However, even though the anti-vibration device described in Patent Document 1 can absorb vibrations by a leaf spring, since it does not have a separate damping mechanism, the vibration energy absorbed only by the internal damping of the leaf spring cannot be sufficiently damped and dissipated. That is, rapid vibration convergence cannot be expected. Also, when the applied vibration is a high-frequency vibration, resonance (surging) may occur when it coincides with the natural frequency of the leaf spring itself.

[0008] The rod body and the elastic member of the anti-vibration device described in Patent Document 1 function as stoppers for restricting excessive vertical displacement of the supported body with respect to the base and suppressing damage. However, it is necessary to separately prepare and attach the rod body and the elastic member, which complicates the structure and makes it difficult to make a small, lightweight, and inexpensive anti-vibration device.

[0009] On the other hand, in the anti-vibration device described in Patent Document 2, since the Ω-shaped spring body is formed by sandwiching a viscoelastic body between two leaf spring materials, it has good vibration damping properties for high-frequency micro-vibrations due to the viscoelastic body sandwiched between the leaf spring materials. However, it is difficult to obtain sufficient damping properties for vibrations with a relatively large amplitude. Also, there is a problem that the structure of the spring member is complicated and thus it becomes expensive.

[0010] The present invention has been made in view of such problems, and has high vibration absorption and vibration damping properties, is small, lightweight, and inexpensive, and is a vibration isolation unit suitable for supporting a vibration-isolated object such as precision machinery, and an object thereof is to provide a vibration isolation support device using the vibration isolation unit.

Means for Solving the Problems

[0011] The vibration isolation unit of the present invention is a vibration isolation unit that intervenes between a base and a vibration-isolated object to support the vibration-isolated object and absorbs vibration applied to the base or the vibration-isolated object, and includes a first spring portion formed by forming a plate-shaped spring member in a U shape, a first connection portion connected to the base, a first extension portion provided between an end portion of the first spring portion on the first connection portion side and the first connection portion, a second spring portion formed by forming a plate-shaped spring member in a U shape and arranged to open in a direction opposite to the opening direction of the first spring portion, a second extension portion provided between an end portion of the second spring portion on the first spring portion side and an end portion of the first spring portion on the second spring portion side, a third spring portion formed by forming a plate-shaped spring member in a U shape and arranged to open in a direction opposite to the opening direction of the second spring portion, a third extension portion provided between an end portion of the third spring portion on the second spring portion side and an end portion of the second spring portion on the third spring portion side, a second connection portion connected to the vibration-isolated object, and a fourth extension portion provided between an end portion of the third spring portion on the second connection portion side and the second connection portion, and a leaf spring member integrally having them, and a vibration isolation member that absorbs vibration applied to the leaf spring member through the base or the vibration-isolated object, and the vibration isolation member has a vibration damping portion fixed to at least inner surfaces of the first spring portion and the third spring portion of the leaf spring member.

[0012] Further, the vibration isolation support device of the present invention includes a plurality of the above-described vibration isolation units that intervene between a base and a vibration-isolated object to support the vibration-isolated object and absorb vibration applied to the base or the vibration-isolated object.

Effects of the Invention

[0013] According to the vibration isolation unit of the present invention, it is possible to absorb vibrations applied to the base or the vibration-isolated object by the leaf spring member, and to attenuate and dissipate the vibration energy absorbed by the vibration isolation member (vibration damping portion).

[0014] Since the vibration damping portion of the vibration isolation member is fixed to the inner surface of the spring portion formed in a U shape, it is possible to obtain a high vibration damping effect against relative movement in any direction between the base and the vibration-isolated member following the deformation of the spring portion. In particular, when the spring portion is deformed in the compression direction (the direction in which the base and the vibration-isolated object approach each other), the vibration damping portion is sandwiched and compressed by the spring portion formed in a U shape. Therefore, the vibration is attenuated by the deformation of the vibration damping portion, and the repulsive force generated by the compression is superimposed on the spring constant of the spring portion. As a result, it exhibits a strong spring constant in the compression direction of the spring portion and supports the load of the vibration-isolated object, and has strong vibration damping properties due to the deformation of the vibration damping portion. And for the direction other than the compression or extension of the leaf spring member, since the influence of the vibration damping portion is small, it can be made into a soft vibration isolation unit. In addition, by arranging the opening directions of the U shapes of the spring portions formed in a U shape to be alternately in the compression direction or the extension direction of the spring portion, large-amplitude vibrations are allowed and buckling of the spring is less likely to occur.

[0015] As a result, it has high vibration absorption and vibration damping properties from low-frequency large-amplitude vibrations to high-frequency micro-vibrations, is small, lightweight, and inexpensive, and is particularly suitable for supporting a supported object such as precision machinery. A vibration isolation unit and a vibration isolation support device using the same can be obtained.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

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Figure 8

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Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0018] <Configuration of the Vibration Isolation Support Device of the First Embodiment> FIGS. 1 and 2 are external views of the vibration isolation support device 40 according to the first embodiment of the present invention. FIG. 1 is a front view, and FIG. 2 is a bottom view.

[0019] As shown in FIGS. 1 and 2, the vibration isolation support device 40 according to the first embodiment of the present invention is a device that intervenes between the base 1 and the vibration-isolated body 2 such as precision machinery, and elastically supports the vibration-isolated body 2 disposed at an interval upward with respect to the base 1. The vibration-isolated body 2 is, for example, a control unit or a sensor mounted on a vehicle, and the base 1 is, for example, a frame of an automobile or an aircraft, and may be installed in an environment prone to vibration.

[0020] The vibration-isolated body 2 is, for example, substantially rectangular box-shaped. Hereinafter, the longitudinal direction of the bottom surface 2a of the vibration-isolated body 2 extending in the horizontal direction will be described as the left-right direction, and the short-side direction will be described as the front-rear direction.

[0021] The vibration isolation support device 40 of this embodiment includes four vibration isolation units 10. The four vibration isolation units 10 support the lower part of the vibration-isolated object 2, and are arranged near the four corners of the bottom surface 2a of the vibration-isolated object 2 which is rectangular. The four vibration isolation units 10 each have a structure for individually supporting the vibration-isolated object 2. For example, four vibration isolation units 10 may be provided on a pedestal on which the vibration-isolated object 2 is placed, and the pedestal and the four vibration isolation units 10 may be integrally configured to form the vibration isolation support device 40.

[0022] The lower part of the vibration isolation unit 10 is fixed to the base 1 by bolts 41, and the upper part of the vibration isolation unit 10 is fixed to the lower part of the vibration-isolated object 2 by bolts 42.

[0023] As shown in FIG. 2, in the vibration isolation support device 40 of this embodiment, among the vibration isolation units 10 arranged at the four corners of the bottom surface 2a of the vibration-isolated object 2, a line Lc connecting the center lines in the width direction of a set of vibration isolation units 10 at diagonal positions passes through the front, rear, left, and right positions of the centroid position C of the vibration-isolated object 2. Specifically, the line Lc connecting the center lines of the vibration isolation units 10 intersects on the vertical line passing through the centroid position C, and the orientation of the opening side of the U-shaped leaf spring member 11 of the vibration isolation unit 10 described later is set.

[0024] Also, the attachment part of the vibration isolation unit 10 to the base 1 and the attachment part to the vibration-isolated object 2 are located between the base 1 and the vibration-isolated object 2. When the middle part in the vertical direction of the vibration isolation unit 10 protrudes laterally more than the vibration-isolated object 2, attachment parts such as bolts 41 and 42 can be avoided, so a larger stroke can be realized. In the vibration isolation support device 40 of the first embodiment, the orientation of the opening side of the U-shaped leaf spring member 11 of the vibration isolation unit 10 described later is set along the line Lc. However, it is preferable to set the orientation of the vibration isolation unit 10 according to the magnitude of the vibration direction in the front-rear or left-right direction of the vibration-isolated object 2.

[0025] <Structure of the Vibration Isolation Unit of the First Embodiment> As shown in FIGS. 3 and 4, the vibration isolation unit 10 of the first embodiment of the present invention integrally includes a leaf spring member 11 disposed between a vibration isolation object 2 and a base 1, and a vibration isolation member 22 that attenuates the vibration of the leaf spring member 11. In the vibration isolation units of the following embodiments, the description will be made using the vertical direction in the state of being disposed in the vibration isolation support device.

[0026] The leaf spring member 11 is formed, for example, by bending an elastic material in the shape of a rectangular plate of metal. Specifically, the leaf spring member 11 includes a first spring portion 12 that is a portion bent in a U shape, a second spring portion 13 that is disposed such that the opening of the U shape formed by the first spring portion 12 faces in the opposite direction to the opening direction of the U shape formed by the first spring portion 12, and a third spring portion 14 that is disposed such that the opening of the U shape formed by the second spring portion 13 faces in the opposite direction to the opening direction of the U shape formed by the second spring portion 13. The leaf spring member 11 further has a first connection portion 15 that is one end portion of the leaf spring member 11 and a second connection portion 16 that is the other end portion. The leaf spring member 11 also has a first extension portion 17 that is a portion between the first connection portion 15 and the end portion of the first spring portion 12 on the side of the first connection portion 15 and is formed in a planar shape, a second extension portion 18 that is a portion between the end portion of the first spring portion 12 on the side of the second spring portion 13 and the end portion of the second spring portion 13 on the side of the first spring portion 12 and is formed in a planar shape, a third extension portion 19 that is a portion between the end portion of the second spring portion 13 on the side of the third spring portion 14 and the end portion of the third spring portion 14 on the side of the second spring portion 13 and is formed in a planar shape, and a fourth extension portion 20 that is a portion between the end portion of the third spring portion 14 on the side of the second connection portion 16 and the second connection portion 16 and is formed in a planar shape. Note that the opening directions of the U shapes of the first spring portion 12, the second spring portion 13, and the third spring portion 14 only need to face each other. As shown in FIG. 4, the first spring portion 12 and the third spring portion 14 open in the left direction in the drawing, while the second spring portion 13 opens in the right direction in the drawing. The first connecting portion 15 and the second connecting portion 16 are each provided with bolt holes 21. The first connecting portion 15 is disposed on the lower side and connected to the base 1 by bolts. The second connecting portion 16 is disposed on the upper side and connected to the vibration-isolated object 2 by bolts. The first connecting portion 15 and the second connecting portion 16 are preferably integrally formed of the same leaf spring material together with the first, second, and third spring portions and the first, second, third, and fourth extension portions, but they may also be formed of different materials such as iron and connected to the first extension portion and the fourth extension portion. Also, in the present embodiment, the first, second, third, and fourth extension portions are formed in a planar shape, but the present invention is not limited thereto. For example, they may have a gentle curved surface and be connected to the first, second, and third spring portions that are connected to each other. Further, the first, second, third, and fourth extension portions can be made extremely short to make the device compact in the left-right direction on the drawing of FIG. 4.

[0027] The vibration damping member 22 is composed of a member having viscoelasticity such as rubber or resin elastomer, etc., and is fixed to the inner surfaces of the first spring portion 12 and the third spring portion 14, that is, the inner surface of the U-shaped bottom formed in a U-shape, by an adhesive or vulcanization adhesion, etc. It has a vibration damping portion 22a, and a vibration damping portion 22b fixed to the outer surface of the second spring portion 13, that is, the outer surface of the U-shaped bottom formed in a U-shape, by an adhesive or vulcanization adhesion, etc. The vibration damping portion 22a has a function of damping the vibrations of the first spring portion 12 and the third spring portion 14, and thus the vibrations of the leaf spring member 11. In addition, the vibration damping portion 22a superimposes a spring force on the leaf spring member 11 in the vertical displacement direction, particularly in the compression direction, and contributes to the load support of the object to be vibration-damped 2 in addition to the vibration damping effect. In the leaf spring member 11 of the present invention, it is preferable that the vibration damping member 22 is provided only on the side of the inner surfaces of the first spring portion 12 and the third spring portion 14, and no vibration damping member functioning as a vibration damping portion is provided on the side of the inner surface of the second spring portion 13. That is, by providing the vibration damping member 22 only on one surface of the leaf spring member 11, it is possible to suppress the surging of the leaf spring member 11 and obtain an inexpensive vibration damping unit 10. Further, by not providing a vibration damping member functioning as a vibration damping portion on the side of the inner surface of the second spring portion 13, in the second spring portion 13, the vibration damping member is not pinched during deformation in the compression direction, and the elongation displacement is not restricted during deformation in the elongation direction. Therefore, a large stroke in the compression and elongation directions can be ensured for the entire vibration damping unit 10.

[0028] <Structure of vibration damping unit of other embodiments> Hereinafter, the vibration damping unit of other embodiments will be described. In the description of other embodiments, the same reference numerals are used for the same configurations as those in the first embodiment.

[0029] FIG. 5 is a front view of the vibration damping unit 30 according to the second embodiment of the present invention. As shown in FIG. 5, in the vibration damping unit 30 according to the second embodiment of the present invention, with respect to the vibration damping unit 10 of the first embodiment, on the outer surface of the second spring portion 13, that is, the outer surface of the second spring portion 13b, the vibration damping member 22 is not provided, and the leaf spring member 11 is exposed. Other configurations are equivalent to those of the vibration damping unit 10 of the first embodiment.

[0030] Thus, by not providing the vibration damping member 22 on the outer surface 13b of the second spring portion, when the vibration damping unit 30 is greatly compressed or extended due to vibration, the first spring portion 12 and the third spring portion 14 having the vibration damping portion 22a (vibration damping member 22) cannot be greatly deformed, while the second spring portion 13 without the vibration damping member 22 can be greatly deformed. Therefore, it is possible to absorb large strokes, that is, large-amplitude low-frequency vibrations. In particular, when the vibration damping unit 30 is greatly extended due to vibration, a force in the peeling direction is applied to the vibration damping portion 22a on the inner surface of the first spring portion 12 and the third spring portion 14. Therefore, by providing the second spring portion 13 without the vibration damping member 22, destruction can be prevented.

[0031] FIG. 6 is a front view of the vibration damping unit 50 according to the third embodiment of the present invention. As shown in FIG. 6, the vibration damping unit 50 according to the third embodiment of the present invention is provided with a vibration damping portion 22c (vibration damping member 22) on the outer surface 13b of the second spring portion, which is the outer surface of the second spring portion 13, with respect to the vibration damping unit 10 of the first embodiment. The vibration damping portion 22c is formed such that the thickness T2 in the vertical direction of the outer surface in the direction from the U-shaped bottom of the second spring portion 13 to the U-shaped curved surface end, that is, in the direction of the end on the first spring portion 12 side and the end on the third spring portion 14 side of the second spring portion 13, is thicker than the thickness T1 in the vertical direction of the vibration damping member on the outer surface of the U-shaped bottom formed in the U-shape of the second spring portion 13. That is, T1 is configured to be thinner than T2. Further, the thickness is formed to gradually decrease from the second extension portion 18 to the third extension portion 19. In the vibration damping unit 50 of the third embodiment, the outer surface of the vibration damping portion 22c is formed to be substantially flat in the vertical direction. Other configurations are the same as those of the vibration damping unit 10 of the first embodiment.

[0032] In this way, by configuring the thickness T2 of the vibration damping member of the vibration damping portion 22c to be greater than the thickness T1, while increasing the volume amount of the vibration damping portion 22c, the protruding amount of the vibration damping portion 22c in the opening direction of the U-shaped of the first spring portion 12 and the third spring portion 14 can be suppressed. Here, since the vibration damping portion 22c is provided on the outer peripheral side of the second spring portion 13, it imparts a weak repulsive force and vibration damping property as compared with the case where it is provided on the inner peripheral side. However, since it does not become an excessive repulsive force, it does not significantly inhibit the deformability of the second spring portion 13, and it is possible to maintain the absorption of large stroke, that is, large amplitude low-frequency vibration. However, if the volume amount of the vibration damping portion 22c is increased to adjust the repulsive force and vibration damping property, the protrusion of the vibration damping portion 22c in the opening direction of the U-shaped of the first spring portion 12 and the third spring portion 14 becomes too large. Therefore, it is preferable to configure the thickness T2 of the vibration damping member of the vibration damping portion 22c to be greater than the thickness T1 to ensure the volume amount of the vibration damping portion 22c.

[0033] <Configuration of the vibration isolation support device of other embodiments> FIG. 7 is an upper perspective view of a vibration isolation support device 60 according to a second embodiment of the present invention using the vibration isolation unit 10 of the first embodiment. FIG. 8 is a top view of the vibration isolation support device 60 according to the second embodiment. FIG. 9 is a cross-sectional view of the vibration isolation support device 60 according to the second embodiment cut along the A - O - A line shown in FIG. 7.

[0034] As shown in FIGS. 7 to 9, the vibration isolation support device 60 of the second embodiment includes five vibration isolation units 10 of the first embodiment, a first fixing member 61 fixed to the base 1, a second fixing member 62 fixed to the vibration-isolated body 2, a first fixing bolt 63 for fixing the first fixing member to the base 1, and a second fixing bolt 64 for fixing the second fixing member 62 to the vibration-isolated body 2. The first fixing bolt 63 is inserted through the bolt holes 21 of the first connection portions 15 of the five vibration isolation units 10 and the screwing holes 65 of the first fixing member 61 and screwed and fastened to be integrated. Further, the second fixing bolt 64 is inserted through the bolt holes 21 of the second connection portions 16 of the five vibration isolation units 10 and the screwing holes 65 of the second fixing member 62 and screwed and fastened to be integrally configured. That is, the five vibration isolation units 10 are integrally formed such that their respective first connection portions 15 are fixed to the first fixing member 61 by the first fixing bolts 63 and their respective second connection portions 16 are fixed to the second fixing member 62 by the second fixing bolts 64, thereby constituting the vibration isolation support device 60. At this time, the five vibration isolation units 10 are radially arranged around the axis L passing through the first fixing bolt 63 and the second fixing bolt 64, and the U-shaped portions of the first spring portion 12 and the third spring portion 14 formed in a U-shape are arranged so as to open toward the axis L. Then, by fixing the first fixing bolt 63 of the vibration isolation support device 60 to the base 1 and fixing the second fixing bolt 64 to the vibration-isolated body 2, the vibration isolation support device 60 elastically supports the vibration-isolated body 2 or the base 1.

[0035] In the vibration isolation support device 60 of the second embodiment, since the five vibration isolation units 10 are radially arranged around the axis L, a vibration-isolated body can be elastically supported by one vibration isolation support device 60. Further, a plurality of vibration isolation support devices 60 may be used according to the load and vibration magnitude of the vibration-isolated body 2, or the number of vibration isolation units 10 of one vibration isolation support device 60 may be changed and adjusted. Further, other vibration isolation units such as the vibration isolation unit 50 can be used instead of the vibration isolation unit 10. When the vibration isolation unit 50 is used, even when it is greatly compressed, the vibration damping portion 22c does not greatly protrude in the direction of the axis L, and it is difficult for the vibration isolation units 50 to come into contact with each other, so that damage caused by the contact can be prevented.

[0036] FIG. 10 is an upper perspective view of a vibration isolation support device 70 according to a third embodiment of the present invention using the vibration isolation unit 10 of the first embodiment. FIG. 11 is a top view of the vibration isolation support device 70 according to the third embodiment. FIG. 12 is a cross-sectional view of the vibration isolation support device 70 according to the third embodiment cut along line B-B shown in FIG. 11.

[0037] As shown in FIGS. 10 to 12, the vibration isolation support device 70 according to the third embodiment is different from the vibration isolation support device of the second embodiment in that, in addition to having four vibration isolation units 10, it includes a flange member 71 for restricting excessive displacement of the vibration isolation unit 10.

[0038] The vibration isolation support device 70 according to the present embodiment includes a flange member 71 that projects outward of the first fixing member 61 between the first fixing member 61 and the first connection portion 15 of the vibration isolation unit 10, and a flange member 71 that projects outward of the second fixing member 62 between the second fixing member 62 and the second connection portion 16 of the vibration isolation unit 10. This flange member 71 is caulked to the first and second fixing members (61, 62) together with the first and second connection portions (15, 16) by pins 72. Note that the flange member may be made of a material that is more difficult to deform than the leaf spring member 11, and is, for example, composed of iron, aluminum, a hard resin plate, or the like.

[0039] The flange member 71 of the vibration isolation support device 70 restricts the first and fourth extension portions (17, 20), specifically, the first and fourth extension portions (17, 20) of the leaf spring member 11 located outside the first and second fixing members (61, 62), from bulging downward in the drawing from the first fixing member 61 and upward in the drawing from the second fixing member 62 when an excessive compressive force is applied to the vibration isolation unit 10, and suppresses the escape of the reaction force generated by the leaf spring member 11 and the vibration damping portion 22a. Further, the breakage of the leaf spring member 11 is suppressed by suppressing the stress concentration generated between the first and second connection portions (15, 16) fixed to the first and second fixing members (61, 62) and the first and fourth extension portions (17, 20). In the vibration isolation unit 10, by angling the first and fourth extension parts (17, 20) with respect to the first and second connection parts (15, 16), a gap 73 can be provided between the flange members 71, so the spring characteristics of the vibration isolation unit 10 can be changed before and after the first and fourth extension parts (17, 20) come into contact with the flange members 71.

[0040] As described above, the vibration isolation support device 70 of the third embodiment has a simple configuration, can change the characteristics of the vibration isolation unit 10 during displacement in the compression direction, and can prevent damage to the leaf spring member 11. Also, in this embodiment, other vibration isolation units such as the vibration isolation unit 50 can be used instead of the vibration isolation unit 10. Further, in this embodiment, the leaf spring member 11 of the vibration isolation unit 10 is caulked to the first and second fixing members (61, 62) with pins 72, but it goes without saying that it may be fixed with bolts or welding. Additionally, although the vibration isolation support device 70 of the third embodiment is assumed to be screwed to the base 1 or the vibration-isolated body 2 with bolts (63, 64), it goes without saying that instead of the bolts (63, 64), insertion holes may be provided in the first and second fixing members (61, 62) and fixed with bolt screws provided on the base 1 or the vibration-isolated body 2 side.

[0041] As in the embodiments described above, by appropriately changing the shapes and arrangements of the leaf spring member 11 and the vibration isolation member 22, the vibration absorption and vibration damping properties can be appropriately changed and combined to set a vibration isolation unit having vibration isolation performance suitable for the required specifications and a vibration isolation support device using the same.

Explanation of Reference Numerals

[0042] 1 Base 2 Vibration-isolated body 10, 30, 50 Vibration isolation units 11 Leaf spring member 12 First spring part 13 Second spring part 14 Third spring part 15 First connection part 16 Second connection part 22 Vibration isolation member Vibration damping parts 22a, 22b, 22c Vibration isolation support devices 40, 60, 70 First fixing member 61 Second fixing member 62 First fixing bolt 63 Second fixing bolt 64 Flange member 71

Claims

1. A vibration isolation unit that is interposed between a base and a vibration-isolated object to support the vibration-isolated object and absorbs vibration applied to the base or the vibration-isolated object, a first spring part formed by shaping a plate-like spring member into a U-shape, a first connection part connected to the base, and a first extension part provided between an end of the first spring part on the first connection part side and the first connection part, a second spring part formed by shaping a plate-like spring member into a U-shape and arranged to open in a direction opposite to the opening direction of the first spring part, and a second extension part provided between an end of the second spring part on the first spring part side and an end of the first spring part on the second spring part side, a third spring part formed by shaping a plate-like spring member into a U-shape and arranged to open in a direction opposite to the opening direction of the second spring part, a third extension part provided between an end of the third spring part on the second spring part side and an end of the second spring part on the third spring part side, a second connection part connected to the vibration-isolated object, and a fourth extension part provided between an end of the third spring part on the second connection part side and the second connection part, a leaf spring member integrally having these, and a vibration isolation member that absorbs vibration applied to the leaf spring member through the base or the vibration-isolated object. The vibration isolation member has vibration damping parts fixed to inner surfaces of at least the first spring part and the third spring part of the leaf spring member. A vibration isolation unit characterized by this.

2. A vibration damping part is fixed to an outer surface of the second spring part of the leaf spring member as a vibration isolation member. The vibration isolation unit according to Claim 1, characterized by this.

3. A vibration damping part is not fixed to an inner surface of the second spring part of the leaf spring member as a vibration isolation member. The vibration isolation unit according to Claim 1 or 2, characterized by this.

4. The vibration damping part fixed to the outer surface of the second spring part of the leaf spring member is formed such that the vertical thickness of the U-shaped bottom part of the U-shape is thinner than the vertical thickness in the direction from the U-shaped bottom part to the end of the U-shaped curved surface. The vibration isolation unit according to Claim 2, characterized by this.

5. A plurality of the vibration isolation units according to Claim 1 or 2 are provided, which are interposed between the base and the vibration-isolated object to support the vibration-isolated object and absorb vibration applied to the base or the vibration-isolated object. A vibration isolation support device characterized by this.

6. The vibration isolation support device according to Claim 5, The anti-vibration support device includes a first fixing member fixed to the base, and the first connection portions of the plurality of anti-vibration units are fixed to the first fixing member. The anti-vibration support device further includes a second fixing member fixed to the object to be anti-vibration supported, and the second connection portions of the plurality of anti-vibration units are fixed to the second fixing member. An anti-vibration support device characterized by the above. **Claim 7** The anti-vibration support device according to claim 6, wherein the first fixing member includes a flange portion that protrudes outward of the first fixing member and restricts the displacement of the anti-vibration unit connected to the first fixing member. The second fixing member includes a flange portion that protrudes outward of the second fixing member and restricts the displacement of the anti-vibration unit connected to the second fixing member. An anti-vibration support device characterized by the above.

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